Alarm.



moved in order to permit access to the room. l

ALARlvLf Specification of Letters Patent.

I, 'UNrTaD srAzrlas PATnn'nonFroa Patented sept-i. A15, 190e.

Application mea october' 26; 1907. serian. staan.

T o all whom. 'it may concern:

Be itgknown that I, JAY A. ROBINSON, a. citizen of the United States, residing in the ci't v` and county of Denver and State-of Colorado, have invented cert-ain new and useful Improvements in Ala-rms; and I do declare the following to be a lull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to thelctters and figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in alarms and consists of an electro-magnet placed in an electric circuit and so locat-ed that when the circuit is closed which is its normal condition when the device is in use, the magnet acts to hold the hook of a tele'- phone receiver in the depressed position. When the device is in use, the receiver is rcmoved from the hook and placed to one side. lYhen used as a burglar alarm, two contacts located in the magnet circuit are arranged to be bridged by a third contact attached to a door or window or other part which must be The opening of t-he door or window breaks the circult, and denere'izes the magnet, allowing the receiver hook to move upwardly,

the magnet then performing the function of holding down the hook.

-Having briefly outlined my improved construction, I will proceed to describe the same in detail reference being made to the accomypanying drawing in which is illustrated an embodiment thereof.

This drawing which consists of a singleV view, illustrates the ap )aratus as a burg ar alarm in connection with a door and window and also as a lire alarm. Y"

ln'the drawing let the numeral 5 designate an ordinary telephone; 6\'the receiver hook thereof; T the receiver and`. 8 .the mouth piece of the transmitter.' Tothe frame work of the telephone is attached tij-*bracket 9 upon which rests an electro-magnet, 10 which when in this position is located-.directly beneath the hook 6 of the telebhohe, beinGr preferably just in the rear of thebifurcate part of the hook. This hook whi al\:\is\ordi narily composed of brass, must be t piipped with a piece of magnetic material 12 1 portier that the magnet may be operative il tile manner just explaine As shown in the drawing a conductor\1=3"\\ leads from one terminal of the magnet 10 th' a pole 14 of an electric source 15. From the opposite pole 16, a conductor 17 leads to a contact 1S located just above a door 19 and adapted to be engaged by a contact plate 20 thus ringing the central tele )hone oflice. attached to the upper end of the door. Lo- S5 Those in charge of the central ol'iice being cated in suitable proximity to the contact 18 cognizant of the fact that the telephones of is a similar Contact 21 which is also adapted 37 the system are connected with the alarm, to be engaged by the plate 20 when the door will know when they answer the call and do is in the closed position. not receive any response, that something is From the plate 2-1 leads a conductor 22, to 90 Y wrong at that particular number and will a contact 23 attached to the frame work 24 therefore notify the police. The ap )aratus of a window 25. One of the sash rails 26 of c may also be used as a fire alarm, by placing a this window is provided with a metal contact readily fusible part in the circuit, the same 27 adapted to bridge the space between the being so located that in the event that the contact 23 and a similar contact 2S also 95 tempera-ture of the room should rise to a mounted on the window frame. From t-he dangerous degree, the said part will melt or contact 2S leads a conductor 29 to a similar di.' fuse, thus breaking the circuit and denergizcontact 23 on the upper art of the. frame, ing the magnet as in the other case. A suit.- while from a contact 28a eads a conductor able switch or circuit-closing dece is located 30. The two contacts 23 and '28 are so lo- 100 in the circuit, for breaking the latter during cated'as to be o erative in connection with the day when the telephone is in use, an( the'up ersasho the window. A conductor 50 when the alarm is not needed. "hen the 30 lea( s to one. extremity of a fusible part 31 occupants are about'to leave the room for the mounted on a stationary support 32; while night, this switch may be closed, and the 'ifrom the o posite extremity of the part 31 105 telephone receiver removed from the hook, leads a con( uctor 33 to a contact 34 adapt-ed to be engaged-by oneixtrmity of a 'switch F rom the conductor 2" leads a branch con'- ductor 38 to the pivot-al extremity 39 of a switch arm 40. T iis switch arm when 1n the closed position or that shown by dotted lines Vin the drawing, engages a contact 41 from conductor 17.

as the sas which leads a branch conductor 42 to the The vlast named construction 1s so arranged that by closing the switch arm 40, the door 19 may be opened and closed without giving the a arm, since. it will be necessary when the other parts of the mechanism are arranged to give the alarm," that the occupant or occupants of the room shall have ameans of exit. The contacts 18 and 21 are of such lengt-h that after the door.` has bec-11 swung during its closing movement to engage the last named contacts, the door will still be open wide enough to allow the person leaving the room and being outside of the door, to reach through andthrow the switch arm to the open position o r that shown by full lines in the drawing. Again if an authorized person wishes to enterlthe room, it will also be necessary in order that the alarm may not be Given, for him to clo'se the switch arm 40 beibre he disengages the door` from the contacts 18 and 21.

From the foregoing ,descri tion the use and operation of my improved) alarm will be readily understood. ,Assuming that the parts are all in the position illustrated in the drawing, it will be understood that the circuit is closed, the magnet 1() energized, and the receiver hook drawn down to the normal position when the receiver is in place. As shown in the drawing the receiver has been removed from the hook. `Now if an unauthorized person should open the door 19, as soon as the contact .20 on the door leaves the contacts 18 and 21 mounted on a suitable stationary support, the electric circuit will be broken, and the magnet 10 denergized. In this event the receiver hook of the telephone will rise to the dotted line position thus ringing central. If central should receive no respouse to the call, it will be understood that something is wrong andthe proper parties will be notified. Now dssuming that the door still remains closed but that an unauthorized person attempts to enter the window by o ening either sash thereof, assoon li is moved sutliciently to disengage its Contact plate 27 from the contacts 23 and 28, the magnet circuit is again broken with the same resixlt, namely the denervizing of the magnet allowing the receiver ook to move upwardly. Again assuming that the door and bot-h window sashes all remain in the elo's'e'd gpsition', and a rebrealrs outix ereby the temperature is raised? the room vt to a sufficient degree to destroyV the fu'sible'lf.`

part 3 1, the circuit willvbe again brokeri with 1 the sameresultas before.

The terms magnetic material and magnetrc parti as usedin t-hc speciicatxonand electro-magnet.

It is evident that my improvement may be employed in connection with a normally open circuit as well as a normally closed circuit. The normally closed circuit only is illustrated in the drawing and herein described in detail. If a normally o en circuit were used, the electro-magnet con d be located above the receiver hook, the latter being normally held down by the receiver. Vhc-n, however, the circuit was closed by the opening of the door or window, the magnet would be encrgized and act to lift the hook with thereceiver thereon thus calling the central oflice l' in the same manner as heretofore described. Having thus described my invention, what I claim is: y Y

1. The combination with a telephone whose hook is provided with a magnetic part, of an electro-magnet located in suitable prom'mity to the receiver hook to hold, l,

the latter in the depressed position, the hook being equipped with 'a'magne-tic part, an electric circuit in which the magnet is located, and means for breaking the circuit whereby the magnet is denergized, substantially as described.

2. The combination with a telephone hav# ing its receiver' hook equipped with a magnetic part, of an electro-magnet located in such proximity to the hook that when the magnet is energized the hook will be drawn downwardly to its normal position as when the receiver is placed thereon, an electric circuit in which the magnet is located, and means for breaking the said circuit.

3. The combination with a telephone, of an electro-magnet located in such proximity to the receiver hook that when the magnet is energized, the hook is drawn 'downwardly to its normal position as when the receiver is thereon, an electric circuit in which the coils of the magnet are located, a; pair of separated contacts located in the circuit, and a third contact mounted en. a movable part and adapted to bridge the i'rst named contacts whereby the circuit is kept closed when the said part is inthe closed position, the arrangement being such that when the aforesaid part is moved to the open position the circuit will be opened and the man'- net denergized, substantially as describe v 4. The combination with a telephone, of A an electro-magnet located in such proximity to the receiver hook that when the magnet is energized, it `will act to draw the receiver A hook do\\nward1y,:the latterbeing equipped 898,992 f i' l' -3 sition, the first named contacts being of such wit out breaking the circuit, and a switch arm located in the circuit and in such proximity to the door jamb, that the arm may Le manipulated before the contact upon` the door leaves the first named contacts for the lenglth that the doormay be partly opened,

' purpose set forth.

6. The combination with a telephone having itsfreceiver hook equipped with a magnetic part, of an electrofmagnet located in such proximity to the hook that when the magnet 1s energized the hook will be actu- 35 ated, an electric circuit in which the magnet is located, and means for making or breaks ing the said circuit.

In testimony whereof I affix. my Signat-ure t 'to the receiver hook, that when the magnet "H5 is energized the hook will be drawn down- Al`\ wai'dly, thc latter being equipped with a magnetic part, a circuit in which the magnet Wm, ...i

`\\.coils are located, a pair of contacts mounted \on a stationary support, a door having a.

2 0 `third contact arranged to bridge the space between the first named contacts and close the. circuit when the'door is in the closed p0- in presence of two witnesses.

JAY A.A ROBINSON. Witnesses:

DENA NELSON, A.. E. OBRIEN. e 

